CN101199239A - Single-stage digital power converter for driving LEDs - Google Patents

Single-stage digital power converter for driving LEDs Download PDF

Info

Publication number
CN101199239A
CN101199239A CNA2006800174774A CN200680017477A CN101199239A CN 101199239 A CN101199239 A CN 101199239A CN A2006800174774 A CNA2006800174774 A CN A2006800174774A CN 200680017477 A CN200680017477 A CN 200680017477A CN 101199239 A CN101199239 A CN 101199239A
Authority
CN
China
Prior art keywords
led
current
control
power
power supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2006800174774A
Other languages
Chinese (zh)
Other versions
CN101199239B (en
Inventor
I-H·吴
M·拉亚巴里
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fairchild Semiconductor Corp
Original Assignee
Fairchild Semiconductor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fairchild Semiconductor Corp filed Critical Fairchild Semiconductor Corp
Publication of CN101199239A publication Critical patent/CN101199239A/en
Application granted granted Critical
Publication of CN101199239B publication Critical patent/CN101199239B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection
    • H05B47/25—Circuit arrangements for protecting against overcurrent
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Rectifiers (AREA)
  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Dc-Dc Converters (AREA)

Abstract

This invention presents a single-stage power converter for driving many number of Light-Emitting-Diode (LED). The power converter converts an AC input voltage into DC current source and regulates the current flowing into the LED. In addition, the AC input current is controlled to have a sinusoidal waveform synchronized with the AC input voltage so that AC input Power Factor is corrected. Hence, both of Power Factor Correction (PFC) and LED current regulation are obtained simultaneously by using a single power conversion stage. So higher efficiency with low cost can be obtained.

Description

The single-stage digital power converter that is used for driving LED
Technical field
The present invention relates to power source conversion, relate in particular to the single-stage digital power converter that is used for driven for emitting lights diode (LED).
Background technology
LED selects as illumination and becomes more and more universal, and has begun to replace the bulb of conventional band filament for a lot of application.LED extensively is used in the traffic lights and the back lighting that is used for liquid crystal display (LCD) screen board now.
In a lot of the application, hope can change the illumination output (being brightness) of LED.Usually, it is difficult controlling LED brightness with voltage control.On the contrary, the brightness of LED is directly proportional with its electric current.Therefore, the electric current that should control LED is controlled LED brightness (for example making the LED deepening).Along with LED constantly popularizes in the application of a large amount of requirement variation brightness level, increasing for the demand of the suitable power supply changeover device of controlling the LED electric current.
In some applications, the power supply of driving LED is to exchange (AC) input form.In this case, need make AC line current and line voltage synchronous, so that the line current distortion minimization maximizes thereby make from the energy of power delivery.If between input voltage and the electric current phase delay is arranged, the energy that is transmitted can be from the power supply to the load cycle.This and its phase difference cosine has reduced the power of transmission from the power supply to the load relatively.If make voltage and line current homophase, phase difference is zero, and its cosine becomes 1.This technology is called as power factor correction (PFC).Sometimes, can make the line current distortion and in line current, cause harmonic wave by the power source conversion processing.
According to some existing designs, the power supply changeover device that is used for LED needs two power stages at least, so that control and power factor correction (PFC) to the LED electric current are provided simultaneously.Each power stage is all carried out the power source conversion of some forms.Typically, the first order is called as voltage pre regulator and PFC is provided control.The second level for DC to the DC transducer and LED is provided Current Control.Because any given power stage is not 100% efficient, for this transducer, on each level, power loss is arranged all.This causes the power supply changeover device overall efficiency to descend.For example, suppose that each efficient of existing two power stages of designing power supply transducer is 90%, overall system efficiency will be 81% (0.90 * 0.90=0.81) so.
Summary of the invention
According to embodiments of the invention, the power supply changeover device with single power stage provides PFC control and LED Current Regulation.This power supply changeover device can have the mixing control technology, and it can be used to digital control method to control the LED electric current, or analog control method is used for highly dynamic (cycle-by-cycle) current protection in cycle one by one.
According to embodiments of the invention, a kind of power supply changeover device that is used to drive at least one light-emitting diode (LED) is provided, described power supply changeover device comprises single-stage, and this single-stage can be worked and be thought that input power provides power factor correction (PFC) and to the control of the electric current that offers at least one LED.
According to another embodiment of the invention, provide a kind of power supply changeover device, be used to utilize input power to drive multi-group light-emitting diode (LED), wherein the diode color in every group is identical.This transducer comprises the device that is used to input power that power factor correction (PFC) is provided; And the device that is used to control the electric current that offers at least one LED.
From the following drawings, specification and claim, those skilled in the art can easily understand important technical advantage of the present invention.
Description of drawings
In order to obtain to understand and understand its more feature and advantage more comprehensively, now in conjunction with the accompanying drawings with reference to following explanation, in the accompanying drawing to of the present invention:
Fig. 1 is the schematic diagram according to the partial block diagram form of the exemplary enforcement of the digital single-stage power converter that is used for driving LED of the embodiment of the invention.
Fig. 2 is the schematic diagram according to the partial block diagram form of the exemplary enforcement of the power block of the embodiment of the invention.
Fig. 3 is the diagram according to the exemplary enforcement of the clock generation module of the embodiment of the invention.
Fig. 4 is the diagram of the exemplary enforcement of digital pulsewidth modulation (PWM) module according to the embodiment of the invention.
Fig. 5 is the diagram according to the exemplary enforcement of the digital PWM module of the embodiment of the invention.
Fig. 6 is the interior block diagram of power controller.
Fig. 7 is the schematic diagram of partial block diagram form of exemplary enforcement of digital single-stage power converter that is used to drive many group LED according to the embodiment of the invention.
Fig. 8 A is the diagram according to the example waveforms that is used for the digital PWM operation of the duty ratio control break of the embodiment of the invention.
Fig. 8 B is the diagram according to the fixing example waveforms that is used for the digital PWM operation of the duty ratio control of the embodiment of the invention.
Fig. 9 is the diagram according to the example operation waveform in the power supply changeover device of the embodiment of the invention.
Embodiment
By the Fig. 1 to 9 in reference to the accompanying drawings, embodiments of the invention and advantage thereof can obtain best appreciated.Similarly Reference numeral is used for the similar and corresponding part of each figure.
Fig. 1 is the schematic diagram of the partial block diagram form of the exemplary enforcement of the digital single-stage power converter 10 that is used to drive one or more light-emitting diodes (LED) 12 according to the embodiment of the invention.As shown in the figure, power supply changeover device 10 comprises electromagnetic interference (EMI) filter 14, rectifier 16 and power block 18.Power supply changeover device 10 receives at its input terminal place and exchanges (AC) voltage Vac, is direct current (DC) voltage Vdc with the AC voltage transitions and is provided for driving LED 12 at its lead-out terminal A and B place and (is designated D separately 1, D 2..., D N-1And D nAnd be used as load coupled) electric current.Power supply changeover device 10 converts the AC high input voltage voltage level of expectation to, and this voltage level can be higher or lower than by the AC incoming level of rectification.This makes it possible to suitably control the LED electric current to obtain the luminance level of expectation.In addition, make AC input current and ac input voltage finely synchronous.If use constant frequency, in the line current triple-frequency harmonics item can appear.In order to address this problem, in one embodiment, power supply changeover device 10 can adopt (based on sine table) duty ratio controlling schemes of modification.Duty ratio controlling schemes control of revising or modification duty ratio are to reduce or eliminate the triple-frequency harmonics in the AC input current.
Electromagnetic interface filter 14 is used for the high harmonic terms that filtering may be caused by the switching manipulation of power block 18, makes that the AC input current can be fundamental frequency (for example 60/50Hz) sinusoidal waveforms.Utilize improved digital pulsewidth modulation (PWM) method, can fundamentally eliminate low frequency (being specially triple-frequency harmonics).The harmonic frequency that is produced by the PWM method is relative high.So, the filter that hangs down cut-off frequency can be used for electromagnetic interface filter 14.Therefore, electromagnetic interface filter 14 can be less relatively not expensive.As understood by those skilled in the art, can realize electromagnetic interface filter 14 with one or more capacitors, transformer or inductor.Rectifier 16 is used for the ac input voltage rectification to produce dc voltage Vdc.As shown in the figure, can realize rectifier 16 with a plurality of diodes that are arranged to the full-wave rectifier structure.
Power block 18 is the single power stage of power supply changeover device 10.Power block 18 receives the ripple dc voltage, because do not had large value capacitor by the dc voltage terminal C two ends of rectification.Therefore, the input voltage of power block 18 become as among Fig. 9 (a) part shown in rectification after ac input voltage.Power block 18 not only converts this ripple DC input voltage to the lead-out terminal A of power block 18 and the voltage stabilizing DC electric current I c at B place, also makes the AC input current become the sinusoidal waveforms synchronous with ac input voltage, makes the power factor of AC input become 1.Control the brightness of one or more LED 12 with voltage stabilizing DC electric current I c.In certain embodiments, can on one or more integrated circuits (IC) device, implement all or part of of power block 18.Therefore, power factor correction (PFC) and LED Current Regulation are supported or provided to power block 18 simultaneously.Because power supply changeover device 10 uses single power stages to realize PFC and two purposes of LED Current Regulation, thus it have more high efficiency than existing design and cost lower.
In one embodiment, the control method of power block 18 enforcements is the mixing of numeral and simulation control.That is power block 18 is the digital control low dynamically control that is used to flow to the electric current I c of LED 12, and simulation control is used for protection at the cycle one by one of overcurrent condition.
Fig. 2 is the schematic diagram according to the partial block diagram form of the exemplary enforcement of the power block 18 of the embodiment of the invention.As shown in the figure, power block 18 comprises resistor 20, diode 22, inductor 24, capacitor 26, diode 28, controller 30, gate drivers 32, mains switch 34, sense resistor 36, resistor 38 and capacitor 40.
Power block 18 receives input voltage Vdc through rectification together with relevant electric current I dc at its input terminal C place.Resistor 20 and diode 22 sensings are through the synchronous regime of the voltage Vdc of rectification.That is resistor 20 and diode 22 can be used to judge or discern each moment of ac input voltage and zero crossings.Provide this signal as controller 30.Main power conversion circuit comprises inductor 24, capacitor 26, diode 28 and the power device 34 with current-sense resistor 36.
In one embodiment, mains switch 34 can be realized with MOSFET or bipolar transistor and insulated gate bipolar transistor (IGBT).The grid of gate drivers 32 driving power switches 34.Controller 30 is used for the driving of 32 pairs of mains switches 34 of control gate driver.Resistor 36 sensings below electric current, it can be used for estimating to offer the electric current of LED 12.With the first feedback current sensing signal I FB1Form current sense is offered controller 30 as feedback.The first feedback current sensing signal I FB1Quick and sensitive relatively feedback is provided, can be used for maybe may causing other situations of damage to protect power block 18 at overcurrent or short-circuit state.Utilize resistor 38 and capacitor 40 (it serves as the filter of stabilization signal) to produce the second feedback current sensing signal I FB2The second feedback current sensing signal I FB2With respect to the first feedback current sensing signal I FB1Provide more slowly but more stable feedback.The second feedback current sensing signal I FB2Also be provided to controller 30 and can be used to judge, show or estimate to offer the electric current of LED 12.Like this, can be with the second feedback current sensing signal I FB2The driving of control switch 34 offers the electric current of LED 12 with adjusting.The first and second feedback current sensing signal I FB1And I FB2It can be analog signal.
Controller 30 receives at input terminal G3 place by diode 22 and develops the crosspoint signal that.Controller 30 receives the first and second feedback current sensing signal I at input terminal G4 and G2 place FB1And I FB2 Controller 30 provides control signal at terminal G0 place to gate drivers 32.Controller 30 can comprise the circuit that is implemented on the single IC device.In one embodiment, for example, can realize controller 30 with the FMS7401 power controller, it can be buied from FairechildSemiconductor Corporation.The interior block diagram of FMS7401 power controller is shown in Figure 6.
As shown in Figure 2, in one embodiment, controller 30 can comprise sine table module 60, multiplier module 62, adder Module 64, modulus (AfD) transducer 66, clock generation module 68, numerical scale integral differential (PID) module 70, digital pulsewidth modulation (PWM) control module 72, delay counter 74 and comparator 76.
Be in operation, power supply changeover device receives ac input voltage Vac at its input terminal place.The waveform of ac input voltage can be described with following formula: v ae ( t ) = y 1 r 2 ~ V ms sin cot , Wherein ω = 2 πf = 2.7 V T . Rectifier 16 offset of sinusoidal ac input voltage Vac carry out the terminal C place generation dc voltage Vdc of rectification with power block in Fig. 1 18.Dc voltage Vdc have Fig. 9's (a) part shown in waveform.Can waveform through the dc voltage Vdc of rectification: v be described with following formula Dc=| V Pk| sin ω t.Use ON time t On, switching frequency f s=l/T sD is defined as with duty ratio: D ≡ lon T s ⇒ t on = T s D . If provide fixed duty cycle control signal (shown in Fig. 9 (b) part) by controller 30, then as Fig. 9 part (c) shown in, switch 34 is with the conducting fixed or be switched on deadline or cut off.The waveform of (c) part of Fig. 9 shows the signal at terminal G0 place, and its driving with the grid of the switch in the control chart 2 34 is provided.
If with ripple dc voltage Vdc actuating switch 34, as shown in Figure 2, inductor current i LFlow to the ground (GND) of terminal E through inductor 24, switch 34 and sense resistor 36 from terminal C (Vdc).Therefore, the mobile electric current stored energy of inductor 24 usefulness.Perhaps, if switch 34 disconnects inductor current i LReduce, the energy that is stored in the inductor 24 is discharged into output capacitor 26 and LED 12 by diode 28.So, in the time of switch 34 conductings, stored energy; Otherwise, when switch 34 disconnects, release energy.In cut-off switch 34, provide LED electric current from capacitor 26.Therefore, no matter what the switch motion of switch 34 is, the LED electric current does not all have flowing of interruption.LED electric current I c is proportional to dutyfactor value, and this value is the ratio of time with the switching time of switch 34 conductings.Make switch 34 conductings longer times or, higher dutyfactor value provides the brightness of higher electric current and bigger LED 12.Therefore, can control LED brightness by regulating dutyfactor value.
Utilize current-sense resistor 36 senses flow through the electric current of switch 34 to produce the first feedback current sensing signal I FB1There is not any time delay ground with the first feedback current sensing signal I FB1Offer the non-counter-rotating input of the comparator 76 of power block 18.If will be used for the adjustable reference voltage V of comparator 76 RefBe set to overcurrent protection (OCP) level, for any fault or the terminal A of power block 18 and any short circuit between the B of one or more LED 12, power supply changeover device 10 can obtain safe protection.Particularly, if the first feedback current sensing signal I FB1Voltage greater than adjustable reference voltage V Ref, the output of comparator 76 uprises, this digital PWM control module 72 that resetted again.Owing between the grid of mains switch 34 and source electrode, capacitor (clearly not illustrating) is arranged, when from gate drivers 32 when the grid of switch 34 sends the high level grid voltage, can sense the gate charges electric current.Because this charging current is not represented the drain current of switch 34, should ignore, thereby the electric current that senses has been represented the real drain current of switch 34.This operation is called as lead-edge-blanking (LEB) operation.In actuating switch 34, delay counter 74 is implemented the lasting setting-up time by delay counter 74 decisions of LEB operation, to ignore the electric current that senses.If the gate time of being set by delay counter 74 after actuating switch 34 expires, delay counter 74 no any time delay ground are transmitted to digital PWM control module 72 with the output signal of comparator 76.Therefore, with the current signal and the reference voltage V that sense RefOutput signal relatively directly sends to digital PWM control module 72, as long as make the current signal I that senses FB1Greater than reference voltage V Ref, its PWM output is with regard to step-down.
A/D converter 66 is parts of controlling the feedback loop of the electric current that offers LED 12.For at overcurrent condition or any fault state protection power block 18, should not have time delay ground and handle current sensing signal, so that effectively cut off switch 34 immediately.This quick protection is under the situation without any above-mentioned delay loop, is carried out by gate drivers 32 by comparator 76 and digital PWM control module 72.Typically, modulus (A/D) transducer needs change-over time; It is not met needs as the protection controller.Therefore, use analog control loop that quick protection operation is provided.Based on shown in Figure 2 comprise that A/D converter 66, digital PID module 70 and adder 64 digital control regulates or control flows to the electric current I c of LED 12.Can use software programming or digital hardware circuit to realize digital PID module 70 and adder 64.A/D converter 66 uses the second feedback current sensing signal I FB2, it is more stable, because the second feedback current sensing signal I FB2Be from the first feedback current sensing signal I FB1Filter out.Filter the first feedback current sensing signal I by resistor 38 and capacitor 40 FB1Produce the second feedback current sensing signal I FB2Because the value of resistor 38 and capacitor 40 is bigger, the second feedback current sensing signal I FB2Value change slowly.The second feedback current sensing signal I FB2Reflected the average current that flows among the LED 12.For digital current control, the second feedback current sensing signal I that uses A/D converter 66 to simulate FB2Convert digital form to.G2 terminal by controller 30 is with the second feedback current sensing signal I FB2Be supplied to the input of A/D converter 66.A/D converter 66 produces the digital value of the current average of representing the LED 12 that flows through.The first and second feedback current sensing signal I FB1And I FB2Be shown in (e) part of Fig. 9.
The duty ratio control that power block 18 can have fixed duty cycle control or change.For fixed duty cycle control, shown in Fig. 8 B, the duty cycle signals value that is used for actuating switch 34 is fixed.Fig. 8 B shows the ac input voltage with fixed duty cycle control and the work key waveforms of electric current.For fixed duty signal, the waveform of AC input current has been shown in Fig. 9 (d) part.For the duty ratio control that changes, shown in Fig. 8 A, the duty cycle signals value that is used for actuating switch 34 change to some extent and with sinusoidal wave DC input voltage waveform Vdc inversely by synchronously.
In the embodiment shown in Figure 2, power block 18 has the duty ratio control of change.The duty ratio control that changes is used for reducing the harmonic wave (for example triple-frequency harmonics) of input AC line current, thereby reduces harmonic distortion.Therefore, the control of the duty ratio of change provides or has supported more total harmonic distortion (THD) power factor correction (PFC).For example, with digital method control AC during to the switching frequency of DC power supply changeover device, if with the control of the constant level shown in Fig. 8 B duty ratio, may cause occurring intrinsic triple-frequency harmonics in the AC input current, at this moment in the DC power supply changeover device, may wish to have PFC at AC.This is a problem, because be difficult to utilize the electromagnetic interface filter with higher cutoff frequency to eliminate this harmonic wave (this may need the electromagnetic interface filter of the heavy and expensive low cut-off frequency of size).
In order to address this problem, internal sine table can be stored, implement or carry out to sine table module 60 for PFC.The addressing in the timer routine of this sine table.As long as ac input voltage vanishing level or by zero point (as resistor 20 and 22 sensings of diode or judgement), the address of sine table module 60 just is initialised and is synchronous with ac input voltage.So can make the line Frequency Synchronization of sine table module 60 and ac input voltage.Revise input current command signal Icom with internal sine table.Therefore, shown in Fig. 8 A, revised duty command.According to the amount of triple-frequency harmonics in the AC input current, the modification factor that provides from sine table 60 is in 0.5 to 0.9 the scope.Current order Icom represents the levels of current that LED is required.This current order Icom is multiplied by the sinusoidal data from sine table 60.Thereby current order Icom obtains the modification shown in Fig. 8 A.With reference to figure 8A, the duty signal level of revising at the center of AC waveform is low.This means with the situation of constant duty ratio control and compare that the peak current level of AC input current obtains a little reducing.Therefore, can effectively eliminate third harmonic problem, thereby reduce or reduce total harmonic distortion (THD).
During near DC input voltage Vdc is zero cross point low value, inductor current i LDiminish.If DC input voltage Vdc is zero, so inductor current i LAlso vanishing.Along with the DC input voltage increases, inductor current i LAlso increase.Therefore, if switching frequency is higher, inductor current i so LMay have high harmonic terms.If these high harmonic terms are eliminated, fundamental frequency is just synchronous with DC input voltage and ac input voltage so, as from (a) of Fig. 9 and (d) part found out.
In the controller 30 that uses the FMS7401 power controller to realize, sine table module 60 can be realized and carried out (referring to Fig. 6) by CPU core by the program among EEPROM or the mask-type ROM of being stored in.The relevant U. S. application No.10/858 that is entitled as " A Modified SinusoidalPulse Width Modulation For Full Digital Power Factor Correction " that submits on June 2nd, 2004, the more details of the duty ratio control that changes are provided in 701, have introduced it in full openly at this.
The output of sine table module 60 is offered multiplier module 62.Multiplier module 62 received current command signal Icom, this signal is modified according to the sine table of module 60.Provide current command signal Icom to control LED electric current I c.In one embodiment, if provide the high value of current command signal Icom, just provide more LED electric currents so that LED 12 is brighter.Multiplier module 62 is according to the output modifications of sine table module 60 (being used for duty ratio) current command signal Icom, so that reduce or eliminate input current i DcIn the triple-frequency harmonics composition.
To be added to output from the output of multiplication module 62 from A/D converter 66 at adder 64 places.The output that digital PID module 70 receives from adder 64.Digital PID module 70 can be realized and be carried out the routine of the output duty cycle value that is used for calculation expectation by software, makes adder 64 be output as zero.For example, can be by average LED levels of current and inner expectation levels of current be relatively accomplished this point.Digital PID module 70 is implemented the digital PID control routine, and those of ordinary skill in the art understands this point.Digital PID routine computes or generation duty cycle control signal, thus LED electric current I c is adjusted to aspiration level.
Digital PWM control module 72 is generally used for partly regulating or controlling the electric current I c that is offered LED 12 by power block 18.Digital PWM control module 72 receives from the output of digital PID module 70 and comes the clock signal of self-clock generation module 68.Digital PWM control module 72 (at terminal G0 place) is provided for the output signal of the grid of control switch 34, as shown in Figure 2.In one embodiment, digital PWM control module 72 can partly implement to be used to regulate the software routines of LED electric current.
As described here, power block 18 can implement to adopt numeral and simulation to control the mixing control technology of the two.Digital control by A/D converter 66, sine table module 60, multiplier module 62, clock generation module 68, digital PID module 70 and 72 enforcements of digital PWM control module, be used to control the electric current that offers LED 12.Simulation control is implemented by comparator 76 and delay counter 74, can be used for overcurrent protection (OCP).A reason of adopt mixing control technology (adopt numeral and simulation control the two) is, uses slower A/D converter to be difficult to provide overcurrent protection, and has the A/D converter faster of quick instruction executive capability and high-speed CPU kernel costliness more.Mix control technology and allow A/D converter 66 is embodied as more at a slow speed A/D converter, so reduced cost.But by analog comparator 76 being used for the very fast performance that the overcurrent protection in cycle one by one provides overcurrent protection.
Controller 30 can receive other input/output signals (for example, being used for order, data or address) at terminal G6 and G7 place.These terminals can be to use any appropriate protocol or technology (I for example 2C) communication port or any other proper port.
Fig. 3 is the diagram according to the exemplary enforcement of the clock generation module 68 of the embodiment of the invention.Clock generation module 68 can be the part of controller 30, and is generally used for providing one or more clocks or oscillator signal for controller 30.As shown in the figure, clock generation module 68 can comprise that internal oscillator 100, clock repair mode transfer piece INIT2 102, digital dock multiplier 104, divider 106 and 112 and multiplexer 108 and 110.
Internal oscillator 100 produces oscillator signal FcIk, and it can have for example frequency of 2MHz.It can be the initialization register that is used to be provided with the frequency of oscillator signal Fclk that clock is repaiied mode transfer piece INIT2 102.Divider 106 receives oscillator signal FcIk and can cut apart its frequency.That is divider 106 produces the clock signal of the part that frequencies are oscillator signal Fclk frequency (for example half).So if oscillator signal FcIk has the frequency of 2MHz, divider 106 can produce the signal that frequency is 1MHz.To offer each A input terminal of multiplier 108 and 110 from the output of the oscillator signal of divider 106.
Digital dock multiplier 104 receives oscillator signal FcIk together with enabling the PLLEN signal.In one embodiment, can realize digital dock multiplier 104 with one or more phase-locked loops (PLL) circuit.Digital dock multiplier 104 can produce has one or more clock signals of frequency separately, these frequencies be the frequency (for example, 4MHz, 8MHz, 16MHz or 32MHz) of oscillator signal Fclk multiple (for example 2 *, 4 *, 8 *, 16 *).The multiplication factor of digital dock multiplier 104 can use 2 FS[1:0] register regulated, FS[LO wherein]=PSCALE[6:5] and enable signal PLLEN=PSCALE[7].PSCALE is stored in 8 place values in the suitable register (PSCALE[8:0]) (referring to Fig. 4).If oscillator signal FcIk is set to 2MHz, depend on FS[1:0], the output of digital dock multiplier 104 can be 8MHz, 16MHz, 32MHz or 64MHz.To offer the B input terminal of multiplexer 110 from the output signal of digital dock multiplier 104.
Multiplexer 110 receives control signal FSEL, and wherein FSEL is the 4th of PSCALE register.In one embodiment, if control signal FSEL=O, multiplexer 110 comes across the signal of its A input terminal so; If control signal FSEL=I, multiplexer 110 comes across the signal at its B input terminal place so.Multiplexer 110 is output as signal Fpwm, and it can be used as the basic clock signal of digital PWM control module 72.As shown in Figure 5, the output of digital dock multiplier 104 sends to digital multiplexer 110 input B.If FSEL=O, the output of multiplexer 110 can be 1MHz, perhaps, if FSEL=I can be one of 8MHz, 16MHz, 32MHz or 64MHz.So, depend on FS[1:0] and the set point of control signal FSEL, the Fpwm clock signal can have from 1MHz for example to the frequency of 64MHz.
Divider 112 receives from the signal Fpwm of multiplexer 110 and can produce the clock signal of the part that frequency is the frequency of signal Fpwm (for example 1/8th).So if oscillator signal Fpwm has the frequency of 8MHz, divider 112 can produce the signal that frequency is 1MHz.To offer the B input terminal of multiplexer 110 from the oscillator signal output of divider 106.
Multiplexer 108 receives control signal FM.In one embodiment, if control signal FM=0, multiplexer 110 comes across the signal at its A input terminal place so; If control signal FM=1, multiplexer 110 comes across the signal at its B input terminal place so.Multiplexer 108 is output as signal Coreclk, and it can be used as the basic clock signal of executive software instruction in the power block 18.
Fig. 4 is the diagram of the exemplary enforcement of digital pulsewidth modulation (PWM) module 72 according to the embodiment of the invention.Digital PWM module 72 can be the part of controller 30.Fig. 5 is the diagram according to the example waveforms of the digital PWM module 72 of the embodiment of the invention.The digital PWM module can be implemented pulse width modulation (PWM).Digital PWM module 72 can be used to provide and is used for the signal of driving of control switch 34.Output signal from digital PWM module 72 can be provided at terminal G0, G1 and G5 place.The output signal at terminal G5 place can be called as high-side signal, and the output signal at terminal G0 place can be called as the low-pressure side output signal.
With reference now to Figure 4 and 5,, as shown in the figure, digital PWM module 72 can comprise divider 80, PSCALE register 81, counter TIMER182, preload register TlRA 83, register TlCMPA 86 and T1CMPB 84, digital comparator 88 and 90 or door 92, with door 94, delay counter 96, register DTIME 98 and XOR gate 97 and 99.
Digital PWM module 72 can receive the clock signal Fpwm of self-clock generation module 68 at divider 80 places.Divider 80 usefulness 2 NRemove the frequency of clock signal Fpwm.Divider 80 may be implemented as 3 PS[2:0] register, wherein PS[2:0]=PSCALE[2:0].PSCALE register 81 can be the register that is used to store the PSCALE value, and it can be 8 place values (for example PSCALE[7:0]).The output of divider 80 is used as the input clock signal of counter TIMERl 82.Counter TIMERl 82 may be implemented as 12 up counters of free-running operation, and its value increases in time, and (referring to Fig. 5) repeated in the back that resets.
Can come the digital drive frequency of control figure PWM module 72 by the value among the change preload register TIRA 83 according to control model.Particularly, preload register 83 is provided for the value of reset counter TIMERl 82 to counter TIMERl 82.With reference to figure 5, when value that the value of counter TIMERl 82 equals to be provided by preload register TIRA 83, counter TIMERl 82 is reset.So, lower if the value that is provided by register TIRA 83 is set to, just obtained higher PWM frequency.
Register T1CMPA 86 and TlCMPB 84 and two digital comparators 88,90 are supported pulse width modulation (PWM).Each of register TlCMPA 86 and TlCMPB 84 can be embodied as 12 bit registers.Digital comparator 88 compares the value of TIMERl and the value of register TlCMPB84.Digital comparator 90 compares the value of TIMERl and the value of register TlCMPA 86.In order to carry out digital power conversion, can be by register being loaded 86 programmings to register TlCMPA, thus driving conducting or break time that can control switch 34.
With reference to figure 5, signal OA is the output of digital comparator 90, and digital comparator 90 is TIMERl and TlCMPA relatively.If the value of TIMERl is greater than the value of TlCMPA, signal OA uprises so.This signal OA is applied to or door 92 and with one of two inputs of door 94 every persons.When the value of TIMER1 reaches the value that is stored among the TIRA 83, make the counter reset of TIMERl.The delay counter 96 of receive clock signal Fpwm makes the signal OA output delay DT one time of delay from digital comparator.Can regulate this time of delay of DT by register DTIME 98.Signal DOA among Fig. 5 is the output of delay counter 96.Signal DOA is than signal OA hysteresis delay time D T.For example, if signal Fpwm has the frequency (t of 32MHz Pwm=31.25ns), DT time of delay can be adjusted to up to 2 μ s (31.25ns * 2 6).The signal DOA of self-dalay counter 96 output in the future be applied to or door 92 and with another of two inputs of every person of door 94.
Or door 92 has the output signal OL that is used for low-pressure side, has with door 94 to be used on high-tension side output signal OH.Delay (referring to Fig. 5) is arranged between output signal OH and the OL.Signal OL is offered an input of XOR gate 97, signal OH is offered an input of XOR gate 99.Internal port PG5 provides another input to XOR gate 97.Internal port PGO provides another input to XOR gate 99.Since need be with signal OL counter-rotating to be used for suitable half-bridge operation, internal port PGO is set to " 1 ".XOR gate 99 is output as the low-pressure side signal that is provided in terminal G0 place, and can be the counter-rotating of signal OL.XOR gate 97 is output as the high-pressure side signal that is provided in terminal G5 place.Between the OL of OH signal and counter-rotating signal, there is time of delay, as shown in Figure 5.This time of delay is by DTIME register 98 definition, constituted a tittle of the dead time between the OL signal of OH and counter-rotating.
Fig. 6 is the interior block diagram of power controller 200, and power controller 200 can be the FMS7401 power controller that can obtain from Fairchild Semiconductor.In one embodiment, can realize the controller 30 of the power block 18 in the power supply changeover device 10 with FMS7401 power controller 200.FMS7401 power controller 200 comprises and is used for here numeral and both elements of simulation control described at controller 30.
For simulation control, power controller 200 has the operational amplifier 202,204 based on simulation, multiplexer 206 and comparator 208 etc.Comparator 208 can be realized the comparator 76 (referring to Fig. 2) of controller 30.
For digital control, power controller has digital hardware block 210 etc.Digital hardware block 210 comprises analog to digital converter (ADC) 212, CPU (CPU) kernel 214, various memory SRAM 216, flash ROM 218 and EEPROM 220, counter 222 and 224, digital pulsewidth modulation (PWM) element 226 and I/O (I/O) port 228.ADC 212 and digital PWM element 226 can be realized the A/D converter 66 and the digital PWM module 72 (referring to Fig. 2) of controller 30.One or more in the various memories 216,218 and 220 can store the software (referring to Fig. 2) that is used for sine table module 60 and digital PID module 70, and this software is carried out by CPU core 214.
Fig. 7 is the schematic diagram of partial block diagram form of exemplary enforcement of digital single-stage power converter 300 that is used to drive many group LED 312a, 312b, 312c and 312d according to the embodiment of the invention.
An example use of this digital single-stage power converter 300 is the back lighting of large-screen LCDCTV (for example size is above 40 inches), and it needs higher brightness.For this brightness is provided, hope is white.Though issued White LED in the recent period, these White LEDs are not used in enough brightness required among the large-screen CTV.Therefore, (for example blue, green, the redness) that might make up or mix different colours organized the white that LED produce the expectation high brightness more.But, the LED of different colours has separately different forward drops and current flow ratings.Therefore need the LED group of every kind of color of individual drive, make the output intensity of different colours to mate.
With reference to figure 7, LED group 312a, 312b, 312c and 312d can have green, redness, blueness and green respectively.Wishing has two groups of green LED, because the output intensity of green LED is weaker than redness and blue led usually.
Can operand word single-stage power converter 300 come the LED of every kind of different colours of drive to organize 312a, 312b, 312c and 312d, control simultaneously offers the electric current of all different LED groups.In this embodiment, power supply changeover device 300 comprises the discrete power block 318 (being identified as 318a, 318b, 318c and 318d independently) that is used for each LED group 312a, 312b, 312c and 312d.Power supply changeover device 300 also has electromagnetic interface filter 314 and rectifier 316.In certain embodiments, can control the electric current that offers all different LED group 312a, 312b, 312c and 312d with the single current order.
The enforcement of each power block 318 can be similar to power block described here 18 substantially.Because the controller 30 of each power block 318 can utilize suitable technology (for example serial communication, I at least in part with digital form work 2C) by proper port the input command of power supply changeover device 300 or driving situation are transferred to external circuit or receive the input command or the driving situation of power supply changeover device 300 from external circuit.With foreign current order control green, redness, blue led group 312a, 312b, 312c and 312d, control the AC input current simultaneously, thereby proofreaied and correct input power factor with low total harmonic distortion (THD).
As described here, a lot of technical advantages are provided according to the single-stage power converter of various embodiments of the present invention.These advantages comprise, for example, can drive the LED of any amount, individually or in groups.This single-stage power converter can have the low-pressure side method for sensing to estimate to flow to the high voltage side current among the LED.In addition, this single-stage power converter can control the LED electric current and to the shaping of AC input current to carry out power factor correction (PFC).This single-stage power converter can implement to have the two mixing control technology of analog-and digital-control.This single-stage power converter for example can also be utilized, and sine table reduces or reduces total harmonic distortion (THD).
Though described the present invention and advantage thereof in detail, should be appreciated that and to make various changes, substitutions and modifications therein and do not deviate from as the defined spirit and scope of claims.That is included discussion is intended to serve as basic a description among the application.Should be appreciated that specific discussion may not can describe all possible embodiment clearly; Many alternatives all imply.Also may intactly not illustrate general property of the present invention, and function or a greater variety of substituting or equivalence element that in fact how each feature or element can represent wide region more may clearly be shown.Once more, these impliedly are included in the disclosure.With the term description of facing device when of the present invention, each element of device is all impliedly carried out function.Specification and term all are not intended to the scope of restriction claim.

Claims (18)

1. power supply changeover device that is used to drive at least one light-emitting diode (LED), described power supply changeover device comprises single-stage, and can operate described power supply changeover device provides power factor correction (PFC) for input power and control to the electric current that offers described at least one LED is provided.
2. power supply changeover device according to claim 1, wherein said single-stage is used the digital control electric current that offers described at least one LED of controlling, and will simulate to control and be used for overcurrent protection.
3. power supply changeover device according to claim 1, the described PFC that wherein is used for input power make the AC electric current of described input power and AC voltage synchronous.
4. power supply changeover device according to claim 1, the described PFC that wherein is used for input power has reduced total harmonic distortion (THD).
5. power supply changeover device according to claim 1, wherein said single-stage comprises the sine table module that is used to reduce total harmonic distortion (THD).
6. power supply changeover device according to claim 1, wherein said single-stage comprise the device of the sync status that is used to discern described input power.
7. power supply changeover device according to claim 6, wherein said input power have AC voltage composition, and the described device that wherein is used to discern sync status can move with discern described AC voltage composition through zero crossing at least one constantly.
8. power supply changeover device according to claim 1, wherein said single-stage comprises:
Switch, electric current flows by this switch according to duty ratio; And
Be couple to the controller of described switch, be used to control the described duty ratio of described switch.
9. power supply changeover device according to claim 8, wherein:
When described switch is cut off, provides more multiple current to described at least one LED, thereby make described at least one LED brighter; And
When described switch is switched on, provides still less electric current to described at least one LED, thereby make described at least one LED darker.
10. single-stage power converter of utilizing input power to drive at least one light-emitting diode (LED), described transducer comprises:
Be used to described input power that the device of power factor correction (PFC) is provided; And
Be used to control the device of the electric current that offers described at least one LED.
11. single-stage power converter according to claim 10 wherein saidly is used to provide the device of PFC to comprise:
Resistor and diode are used to discern the sync status of described input power; And
Sine table module is used to make the electric current composition of described input power and voltage composition synchronous.
12. single-stage power converter according to claim 10, the described device that wherein is used for Control current comprises current sensing device, is used to generate the flow through signal of the magnitude of current of a branch road of described power supply changeover device of expression.
13. single-stage power converter according to claim 10 comprises switch, according to the duty cycle current described switch of flowing through, the described device that wherein is used to control is couple to described switch to control described duty ratio.
14. single-stage power converter according to claim 13, wherein:
When described switch is cut off, provides more multiple current to described at least one LED, thereby make described at least one LED brighter; And
When described switch is switched on, provides still less electric current to described at least one LED, thereby make described at least one LED darker.
15. single-stage power converter according to claim 10, the wherein said device that is used to control provides overcurrent protection.
16. single-stage power converter according to claim 15, the wherein said device that is used to control uses the digital control electric current that offers described at least one LED of controlling, and will simulate to control and be used for overcurrent protection.
17. a power supply changeover device that uses input power to drive multi-group light-emitting diode (LED), wherein the diode in every group is a same color, and described transducer comprises:
Be used to described input power that the device of power factor correction (PFC) is provided; And
Be used to control the device of the electric current that offers described at least one LED.
18. a single-stage power converter that is used to drive at least one light-emitting diode (LED) comprises:
Input terminal is used to receive interchange (AC) input power through rectification;
Lead-out terminal provides drive current at described lead-out terminal place to described at least one LED;
Switch can be controlled described switch according to duty ratio, is used to increase and reduce to offer the described drive current of described at least one LED;
Be used to input power to provide the device of power factor correction (PFC), described device to comprise to be used for the device of the sync status of discerning described input power;
Be used for recently controlling the device of the electric current that offers described at least one LED by the described duty of regulating described switch, described device comprises the current sensing device that is couple to described switch, is used to generate the signal that expression flows to the magnitude of current of described at least one LED;
Be couple to the transistor of the primary coil of described transformer, be used for the electric current of control flows through described primary coil;
Be couple to described transistorized current sensing device, be used to generate the flow through signal of the magnitude of current of described power supply changeover device of expression, described current sensing device is formed for the part of the current control loop of described power supply changeover device;
Can work digital control with the described voltage control loop of the simulation of the described current control loop that described power supply changeover device is provided control and described power supply changeover device of controller, described controller.
CN2006800174774A 2005-03-22 2006-03-22 Single-stage digital power converter for driving LEDs Expired - Fee Related CN101199239B (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US11/086,955 2005-03-22
US11/086,955 US7378805B2 (en) 2005-03-22 2005-03-22 Single-stage digital power converter for driving LEDs
PCT/US2006/010301 WO2006102355A2 (en) 2005-03-22 2006-03-22 Single-stage digital power converter for driving leds

Publications (2)

Publication Number Publication Date
CN101199239A true CN101199239A (en) 2008-06-11
CN101199239B CN101199239B (en) 2011-10-05

Family

ID=37024541

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2006800174774A Expired - Fee Related CN101199239B (en) 2005-03-22 2006-03-22 Single-stage digital power converter for driving LEDs

Country Status (6)

Country Link
US (1) US7378805B2 (en)
JP (1) JP2008537459A (en)
KR (1) KR101365924B1 (en)
CN (1) CN101199239B (en)
TW (1) TWI446833B (en)
WO (1) WO2006102355A2 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101932172A (en) * 2009-06-22 2010-12-29 理察·蓝德立·葛瑞 Power reforming method and lighting device thereof
CN102362553A (en) * 2009-01-27 2012-02-22 Led道路照明有限公司 Power supply for light emitting diode roadway lighting fixture
CN102427343A (en) * 2011-12-02 2012-04-25 成都芯源系统有限公司 Timing signal generating circuit and method and power supply circuit
CN102474953A (en) * 2009-07-28 2012-05-23 首尔半导体股份有限公司 Dimming device for a lighting apparatus
CN101374380B (en) * 2007-07-27 2012-06-27 财团法人工业技术研究院 Light source device and drive device thereof
CN102684656A (en) * 2011-03-09 2012-09-19 三菱电机株式会社 Gate circuit
CN102843026A (en) * 2012-08-17 2012-12-26 佛山市柏克新能科技股份有限公司 Active power factor correction (PFC) control circuit based on complex programmable logic device (CPLD)
CN102177766B (en) * 2008-10-09 2014-02-26 赤多尼科有限公司 Driver circuit for a semiconductor light source (led)
CN103841712A (en) * 2012-11-27 2014-06-04 中国科学院沈阳自动化研究所 System and method for controlling LED light source
CN104429160A (en) * 2012-06-27 2015-03-18 皇家飞利浦有限公司 Driver circuit between electromagnetic ballast and LED
CN102128973B (en) * 2010-01-19 2015-05-20 深圳艾科创新微电子有限公司 Voltage zero-crossing detecting circuit and DC-DC converter with same
CN108075634A (en) * 2016-11-17 2018-05-25 台达电子电源(东莞)有限公司 For the control device and control method of power factor correcting converter
CN108646635A (en) * 2018-06-27 2018-10-12 广东好帮手环球科技有限公司 A kind of power control

Families Citing this family (220)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100778178B1 (en) * 2000-07-07 2007-11-22 모사이드 테크놀로지스 코포레이션 Method and apparatus for synchronization of row and column access operations
US7888881B2 (en) * 2005-07-28 2011-02-15 Exclara, Inc. Pulsed current averaging controller with amplitude modulation and time division multiplexing for arrays of independent pluralities of light emitting diodes
US7245089B2 (en) * 2005-11-03 2007-07-17 System General Corporation Switching LED driver
US7259525B2 (en) * 2005-11-03 2007-08-21 System General Corporation High efficiency switching LED driver
US7245090B2 (en) * 2005-11-08 2007-07-17 System General Corporation Switching LED driver with temperature compensation to program LED current
KR101300007B1 (en) * 2006-02-10 2013-08-27 필립스 솔리드-스테이트 라이팅 솔루션스, 인크. Methods and apparatus for high power factor controlled power delivery using a single switching stage per load
JP5289684B2 (en) * 2006-03-24 2013-09-11 ローム株式会社 Light emission control device, display device, drive control device, control device
US7701152B2 (en) * 2006-11-22 2010-04-20 Texas Instruments Incorporated Method and circuit for controlling operation of a light-emitting diode
US7852017B1 (en) * 2007-03-12 2010-12-14 Cirrus Logic, Inc. Ballast for light emitting diode light sources
US8018171B1 (en) 2007-03-12 2011-09-13 Cirrus Logic, Inc. Multi-function duty cycle modifier
US7667408B2 (en) 2007-03-12 2010-02-23 Cirrus Logic, Inc. Lighting system with lighting dimmer output mapping
US8076920B1 (en) 2007-03-12 2011-12-13 Cirrus Logic, Inc. Switching power converter and control system
US8723438B2 (en) * 2007-03-12 2014-05-13 Cirrus Logic, Inc. Switch power converter control with spread spectrum based electromagnetic interference reduction
DE102007015508B4 (en) * 2007-03-28 2016-04-28 Tridonic Gmbh & Co Kg Digital control circuit of an operating device for lamps and method for operating a control gear
KR20100016013A (en) * 2007-03-30 2010-02-12 홀딥 리미티드 Improvements relating to lighting systems
US8619442B2 (en) * 2007-04-06 2013-12-31 Robert S. Wrathall Boost-buck power factor correction
US7535183B2 (en) * 2007-04-27 2009-05-19 Korry Electronics Co. Apparatus and method to provide a hybrid linear/switching current source, such as for high-efficiency, wide dimming range light emitting diode (LED) backlighting
US7554473B2 (en) 2007-05-02 2009-06-30 Cirrus Logic, Inc. Control system using a nonlinear delta-sigma modulator with nonlinear process modeling
CN101675290B (en) * 2007-05-04 2012-12-26 皇家飞利浦电子股份有限公司 Led-based fixtures and related methods for thermal management
EP2592904A1 (en) * 2007-05-07 2013-05-15 Koninklijke Philips Electronics N.V. High power factor LED-based lighting apparatus and methods
US8102127B2 (en) 2007-06-24 2012-01-24 Cirrus Logic, Inc. Hybrid gas discharge lamp-LED lighting system
KR100893193B1 (en) * 2007-06-26 2009-04-16 주식회사 우영 Apparatus for power supply and light emitting diode light therewith
US7888888B2 (en) 2007-07-11 2011-02-15 Industrial Technology Research Institute Light source apparatus and driving apparatus thereof
US20090015174A1 (en) * 2007-07-11 2009-01-15 Industrial Technology Research Institute Light source apparatus and driving apparatus thereof
DE102007049533B4 (en) * 2007-10-16 2017-02-23 Tridonic Gmbh & Co Kg Operating circuit for light-emitting diodes and method for operating light-emitting diodes
JP2009123681A (en) * 2007-10-25 2009-06-04 Panasonic Electric Works Co Ltd Led dimming apparatus
US8118447B2 (en) 2007-12-20 2012-02-21 Altair Engineering, Inc. LED lighting apparatus with swivel connection
US8022683B2 (en) 2008-01-30 2011-09-20 Cirrus Logic, Inc. Powering a power supply integrated circuit with sense current
US8576589B2 (en) 2008-01-30 2013-11-05 Cirrus Logic, Inc. Switch state controller with a sense current generated operating voltage
US8008898B2 (en) 2008-01-30 2011-08-30 Cirrus Logic, Inc. Switching regulator with boosted auxiliary winding supply
US7834561B2 (en) * 2008-02-01 2010-11-16 Pacific Tech Microelectronics Systems and methods for powering a light emitting diode lamp
US8502454B2 (en) 2008-02-08 2013-08-06 Innosys, Inc Solid state semiconductor LED replacement for fluorescent lamps
US8207687B1 (en) 2008-02-15 2012-06-26 Cooper Technologies Company Dimmable driver circuits for light emitting diodes
US8378957B2 (en) * 2008-04-28 2013-02-19 Atmel Corporation Methods and circuits for triode region detection
US8581810B2 (en) * 2008-03-11 2013-11-12 Atmel Corporation Methods and circuits for self-calibrating controller
US8493300B2 (en) * 2008-03-11 2013-07-23 Atmel Corporation Architecture and technique for inter-chip communication
US8288967B2 (en) * 2008-03-21 2012-10-16 Richtek Technology Corp. LED control circuit and method
TWI397349B (en) * 2008-03-21 2013-05-21 Richtek Technology Corp Led control circuit and method, and insect resistive led lamp
US7952293B2 (en) * 2008-04-30 2011-05-31 Lsi Industries, Inc. Power factor correction and driver circuits
US8432108B2 (en) * 2008-04-30 2013-04-30 Lsi Industries, Inc. Solid state lighting, driver circuits, and related software
US8360599B2 (en) 2008-05-23 2013-01-29 Ilumisys, Inc. Electric shock resistant L.E.D. based light
KR101594544B1 (en) * 2008-06-17 2016-02-16 코닌클리케 필립스 엔.브이. Harmonic compensation circuit and method for an led light unit
TWI384898B (en) * 2008-06-18 2013-02-01 Delta Electronics Inc Dimmable led driving circuit
US8314572B2 (en) * 2008-06-24 2012-11-20 Atmel Corporation Apparatus and methodology for enhancing efficiency of a power distribution system having power factor correction capability by using a self-calibrating controller
WO2009156891A1 (en) * 2008-06-26 2009-12-30 Nxp B.V. Switch mode power supplies
US8847719B2 (en) 2008-07-25 2014-09-30 Cirrus Logic, Inc. Transformer with split primary winding
US8212491B2 (en) 2008-07-25 2012-07-03 Cirrus Logic, Inc. Switching power converter control with triac-based leading edge dimmer compatibility
US8344707B2 (en) 2008-07-25 2013-01-01 Cirrus Logic, Inc. Current sensing in a switching power converter
JP2012501049A (en) * 2008-08-21 2012-01-12 アメリカン ブライト ライティング， インク． LED light engine
US8487546B2 (en) 2008-08-29 2013-07-16 Cirrus Logic, Inc. LED lighting system with accurate current control
KR101001241B1 (en) * 2008-09-05 2010-12-17 서울반도체 주식회사 Ac led dimmer and dimming method thereby
US8354800B2 (en) * 2008-09-07 2013-01-15 Q Technology, Inc. Lighting source with low total harmonic distortion
US8222872B1 (en) 2008-09-30 2012-07-17 Cirrus Logic, Inc. Switching power converter with selectable mode auxiliary power supply
US8179110B2 (en) 2008-09-30 2012-05-15 Cirrus Logic Inc. Adjustable constant current source with continuous conduction mode (“CCM”) and discontinuous conduction mode (“DCM”) operation
TWI586216B (en) 2008-10-08 2017-06-01 Holdip Ltd Improvements relating to lighting systems
US8214084B2 (en) 2008-10-24 2012-07-03 Ilumisys, Inc. Integration of LED lighting with building controls
US8901823B2 (en) 2008-10-24 2014-12-02 Ilumisys, Inc. Light and light sensor
US8324817B2 (en) 2008-10-24 2012-12-04 Ilumisys, Inc. Light and light sensor
US8653984B2 (en) 2008-10-24 2014-02-18 Ilumisys, Inc. Integration of LED lighting control with emergency notification systems
US7938562B2 (en) 2008-10-24 2011-05-10 Altair Engineering, Inc. Lighting including integral communication apparatus
US8288954B2 (en) 2008-12-07 2012-10-16 Cirrus Logic, Inc. Primary-side based control of secondary-side current for a transformer
US8362707B2 (en) 2008-12-12 2013-01-29 Cirrus Logic, Inc. Light emitting diode based lighting system with time division ambient light feedback response
US8299722B2 (en) 2008-12-12 2012-10-30 Cirrus Logic, Inc. Time division light output sensing and brightness adjustment for different spectra of light emitting diodes
TWI418133B (en) * 2008-12-31 2013-12-01 Macroblock Inc Single-stage high-power-factor isolated ac-to-dc converter with leakage inductor energy restoration
US7994863B2 (en) * 2008-12-31 2011-08-09 Cirrus Logic, Inc. Electronic system having common mode voltage range enhancement
US8362710B2 (en) 2009-01-21 2013-01-29 Ilumisys, Inc. Direct AC-to-DC converter for passive component minimization and universal operation of LED arrays
JP5592613B2 (en) * 2009-01-22 2014-09-17 パナソニック株式会社 Power supply device and lighting apparatus using the same
JP5462492B2 (en) * 2009-01-30 2014-04-02 パナソニック株式会社 LED power supply circuit and lighting apparatus using the same
US20100213483A1 (en) * 2009-02-24 2010-08-26 Andrew Locke Illumination device
US8203287B2 (en) * 2009-02-24 2012-06-19 Richard Landry Gray Pulse width modulation control device
US8228001B2 (en) * 2009-02-24 2012-07-24 Suntec Enterprises Method and apparatus of driving LED and OLED devices
TW201034513A (en) * 2009-03-11 2010-09-16 ke-wei Zhou Driver device for LED
US8441199B2 (en) * 2009-03-23 2013-05-14 Atmel Corporation Method and apparatus for an intelligent light emitting diode driver having power factor correction capability
US8148907B2 (en) * 2009-04-11 2012-04-03 Sadwick Laurence P Dimmable power supply
DE102009017139A1 (en) * 2009-04-14 2010-10-21 Tridonicatco Gmbh & Co. Kg LED e.g. organic LED, regulating method for illumination system, involves utilizing measured actual value as feedback variable for regulation of LED, where actual value is compared with reference value
US8482223B2 (en) 2009-04-30 2013-07-09 Cirrus Logic, Inc. Calibration of lamps
TWI495393B (en) * 2009-05-09 2015-08-01 Innosys Inc Universal dimmer
US7994730B2 (en) * 2009-06-04 2011-08-09 Apple Inc. Pulse width modulation (PWM) closed loop LED current driver in an embedded system
US8248145B2 (en) 2009-06-30 2012-08-21 Cirrus Logic, Inc. Cascode configured switching using at least one low breakdown voltage internal, integrated circuit switch to control at least one high breakdown voltage external switch
US8198874B2 (en) 2009-06-30 2012-06-12 Cirrus Logic, Inc. Switching power converter with current sensing transformer auxiliary power supply
US8212493B2 (en) * 2009-06-30 2012-07-03 Cirrus Logic, Inc. Low energy transfer mode for auxiliary power supply operation in a cascaded switching power converter
TWI398187B (en) * 2009-06-30 2013-06-01 Hon Hai Prec Ind Co Ltd Controlling circuit for led
US8963535B1 (en) 2009-06-30 2015-02-24 Cirrus Logic, Inc. Switch controlled current sensing using a hall effect sensor
DE102010005743A1 (en) * 2009-07-09 2011-01-13 Siteco Beleuchtungstechnik Gmbh LED control
TWI407833B (en) * 2009-07-15 2013-09-01 Richtek Technology Corp Driver circuit and method for driving load circuit
US8536803B2 (en) * 2009-07-16 2013-09-17 Innosys, Inc Fluorescent lamp power supply
CN102612862B (en) * 2009-08-14 2015-06-03 万斯创新股份有限公司 Spectral shift control for dimmable AC led lighting
TWI424788B (en) * 2009-08-14 2014-01-21 Fsp Technology Inc Driving apparatus for light emitting diodes
US9380665B2 (en) 2009-08-14 2016-06-28 Once Innovations, Inc. Spectral shift control for dimmable AC LED lighting
US8373363B2 (en) 2009-08-14 2013-02-12 Once Innovations, Inc. Reduction of harmonic distortion for LED loads
US9433046B2 (en) 2011-01-21 2016-08-30 Once Innovations, Inc. Driving circuitry for LED lighting with reduced total harmonic distortion
US8643308B2 (en) 2009-08-14 2014-02-04 Once Innovations, Inc. Spectral shift control for dimmable AC LED lighting
US9232590B2 (en) 2009-08-14 2016-01-05 Once Innovations, Inc. Driving circuitry for LED lighting with reduced total harmonic distortion
US9155174B2 (en) 2009-09-30 2015-10-06 Cirrus Logic, Inc. Phase control dimming compatible lighting systems
US8466628B2 (en) 2009-10-07 2013-06-18 Lutron Electronics Co., Inc. Closed-loop load control circuit having a wide output range
US9178415B1 (en) 2009-10-15 2015-11-03 Cirrus Logic, Inc. Inductor over-current protection using a volt-second value representing an input voltage to a switching power converter
US8487591B1 (en) 2009-12-31 2013-07-16 Cirrus Logic, Inc. Power control system with power drop out immunity and uncompromised startup time
JP5473531B2 (en) * 2009-10-22 2014-04-16 ラピスセミコンダクタ株式会社 Bias potential generator
US8654483B2 (en) 2009-11-09 2014-02-18 Cirrus Logic, Inc. Power system having voltage-based monitoring for over current protection
CN102948256B (en) * 2009-11-26 2015-11-25 辛智烨 There is the energy-saving LED of dimmed function and mood-Lighting control function
WO2011067974A1 (en) 2009-12-04 2011-06-09 株式会社村田製作所 Pfc converter
KR20120113752A (en) * 2009-12-08 2012-10-15 코닌클리즈케 필립스 일렉트로닉스 엔.브이. Driver for a solid state lamp
US8164275B2 (en) * 2009-12-15 2012-04-24 Tdk-Lambda Americas Inc. Drive circuit for high-brightness light emitting diodes
CN102105004B (en) * 2009-12-18 2014-09-10 鸿富锦精密工业（深圳）有限公司 Multi-light source control circuit
CN101711081B (en) * 2009-12-21 2013-04-03 Bcd半导体制造有限公司 LED driving circuit
KR101592381B1 (en) * 2010-01-06 2016-02-11 삼성디스플레이 주식회사 Method of driving a light source and light source apparatus for performing the method
JP2011151913A (en) * 2010-01-20 2011-08-04 Mitsubishi Electric Corp Power supply circuit and lighting device
CN101742785A (en) * 2010-01-26 2010-06-16 威海半岛东电子有限公司 Intelligent dimming three-primary-color LED street lamp controller
US8098503B2 (en) 2010-02-09 2012-01-17 Power Integrations, Inc. Method and apparatus to control a power converter having a low loop bandwidth
TWI437914B (en) * 2010-03-11 2014-05-11 Richtek Technology Corp Led control circuit and method
US9482397B2 (en) 2010-03-17 2016-11-01 Once Innovations, Inc. Light sources adapted to spectral sensitivity of diurnal avians and humans
WO2011119921A2 (en) 2010-03-26 2011-09-29 Altair Engineering, Inc. Led light with thermoelectric generator
WO2011119958A1 (en) 2010-03-26 2011-09-29 Altair Engineering, Inc. Inside-out led bulb
JP2011254665A (en) * 2010-06-03 2011-12-15 On Semiconductor Trading Ltd Control circuit of light-emitting element
JP5506561B2 (en) * 2010-06-21 2014-05-28 株式会社日立製作所 Lighting device
CN102340904B (en) 2010-07-14 2015-06-17 通用电气公司 Light-emitting diode driving device and driving method thereof
US9000744B2 (en) * 2010-07-21 2015-04-07 Fairchild Korea Semiconductor Ltd. Switch control device with zero-cross point estimation by edge detection, power supply device comprising the same, and switch control method with zero-cross point estimation by edge detection
TWI407676B (en) * 2010-07-28 2013-09-01 Inergy Technology Inc Control circuit for detecting the output current of the power converter circuit
US8536799B1 (en) 2010-07-30 2013-09-17 Cirrus Logic, Inc. Dimmer detection
US8912781B2 (en) 2010-07-30 2014-12-16 Cirrus Logic, Inc. Integrated circuit switching power supply controller with selectable buck mode operation
US8569972B2 (en) 2010-08-17 2013-10-29 Cirrus Logic, Inc. Dimmer output emulation
US9510401B1 (en) 2010-08-24 2016-11-29 Cirrus Logic, Inc. Reduced standby power in an electronic power control system
WO2012027463A2 (en) 2010-08-27 2012-03-01 American Bright Lighting, Inc. Solid state lighting driver with thdi bypass circuit
KR101083785B1 (en) 2010-10-06 2011-11-18 (주) 이노비전 Led driving circuit for lightening
DE112011103376A5 (en) * 2010-10-08 2013-07-18 Tridonic Gmbh & Co. Kg PWM dimming of bulbs
WO2012058556A2 (en) 2010-10-29 2012-05-03 Altair Engineering, Inc. Mechanisms for reducing risk of shock during installation of light tube
WO2012061782A2 (en) * 2010-11-04 2012-05-10 Cirrus Logic, Inc. Thermal management in a lighting system using multiple, controlled power dissipation circuits
KR101189253B1 (en) * 2010-11-10 2012-10-09 매그나칩 반도체 유한회사 Pwm signal generating circuit for dc-dc converter using diming signal and led driver circuit having the same in fixed phase digital dimming method
US8773031B2 (en) 2010-11-22 2014-07-08 Innosys, Inc. Dimmable timer-based LED power supply
CN103370990B (en) 2010-12-16 2016-06-15 皇家飞利浦有限公司 Based on the discontinuous mode-critical conduction mode conversion of switch parameter
KR101179413B1 (en) * 2010-12-24 2012-09-03 삼성전기주식회사 Digital pwm generator, and driving apparatus of light emitting display
GB2491550A (en) * 2011-01-17 2012-12-12 Radiant Res Ltd A hybrid power control system using dynamic power regulation to increase the dimming dynamic range and power control of solid-state illumination systems
JP5936146B2 (en) * 2011-01-21 2016-06-15 ワンス イノヴェイションズ, インコーポレイテッドOnce Innovations, Inc. Driving circuit for LED lighting with reduced total harmonic distortion
US10321541B2 (en) 2011-03-11 2019-06-11 Ilumi Solutions, Inc. LED lighting device
US10630820B2 (en) 2011-03-11 2020-04-21 Ilumi Solutions, Inc. Wireless communication methods
US8890435B2 (en) 2011-03-11 2014-11-18 Ilumi Solutions, Inc. Wireless lighting control system
US8680787B2 (en) 2011-03-15 2014-03-25 Lutron Electronics Co., Inc. Load control device for a light-emitting diode light source
US8598810B2 (en) 2011-05-05 2013-12-03 Excelliance Mos Corporation Constant current driving circuit of light emitting diode and lighting apparatus
WO2012167127A1 (en) 2011-06-03 2012-12-06 Cirrus Logic, Inc. Control data determination from primary-side sensing of a secondary-side voltage in a switching power converter
US9351356B2 (en) 2011-06-03 2016-05-24 Koninklijke Philips N.V. Primary-side control of a switching power converter with feed forward delay compensation
US8723425B2 (en) 2011-06-17 2014-05-13 Stevan Pokrajac Light emitting diode driver circuit
US8593075B1 (en) 2011-06-30 2013-11-26 Cirrus Logic, Inc. Constant current controller with selectable gain
US9072171B2 (en) 2011-08-24 2015-06-30 Ilumisys, Inc. Circuit board mount for LED light
US8866392B2 (en) * 2011-08-31 2014-10-21 Chia-Teh Chen Two-level LED security light with motion sensor
US8624517B2 (en) * 2011-09-20 2014-01-07 Shenzhen China Star Optoelectronics Technology., Ltd. LED dimming drive device, method and LCD
US8803437B2 (en) 2011-09-25 2014-08-12 Wen-Hsiung Hsieh Switching mode pulsed current supply for driving LEDS
US9035573B2 (en) * 2011-10-24 2015-05-19 Minebea Co., Ltd. Power supply device
US9066403B2 (en) 2011-11-29 2015-06-23 GE Lighting Solutions, LLC LED lamp with half wave dimming
WO2013090845A2 (en) 2011-12-14 2013-06-20 Cirrus Logic, Inc. Multi-mode flyback control for a switching power converter
US9374985B2 (en) 2011-12-14 2016-06-28 Once Innovations, Inc. Method of manufacturing of a light emitting system with adjustable watt equivalence
US8987997B2 (en) 2012-02-17 2015-03-24 Innosys, Inc. Dimming driver with stealer switch
WO2013131002A1 (en) 2012-03-02 2013-09-06 Ilumisys, Inc. Electrical connector header for an led-based light
US8823283B2 (en) * 2012-03-13 2014-09-02 Dialog Semiconductor Inc. Power dissipation monitor for current sink function of power switching transistor
CN102629863A (en) * 2012-04-06 2012-08-08 开源集成电路(苏州)有限公司 PWM (Pulse Width Modulation) circuit and LED drive circuit
CN102752912B (en) * 2012-06-01 2015-11-25 台达电子企业管理（上海）有限公司 A kind of LED drive circuit
RU2630476C2 (en) * 2012-06-07 2017-09-11 Филипс Лайтинг Холдинг Б.В. System and method of emergency lighting
WO2014008463A1 (en) 2012-07-06 2014-01-09 Ilumisys, Inc. Power supply assembly for led-based light tube
US9271367B2 (en) 2012-07-09 2016-02-23 Ilumisys, Inc. System and method for controlling operation of an LED-based light
US9179514B2 (en) * 2012-07-11 2015-11-03 Roal Electronics S.P.A. Control circuit for reducing of total harmonic distortion (THD) in the power supply to an electric load
US8810147B2 (en) 2012-07-15 2014-08-19 Wen-Hsiung Hsieh Method and circuit for driving LEDs with a pulsed current
US8787039B2 (en) * 2012-07-18 2014-07-22 Dialog Semiconductor Inc. Hybrid adaptive power factor correction schemes for switching power converters
US9520794B2 (en) 2012-07-25 2016-12-13 Philips Lighting Holding B.V Acceleration of output energy provision for a load during start-up of a switching power converter
CN103683894B (en) * 2012-08-31 2017-12-26 欧司朗股份有限公司 Circuit of power factor correction and the driver comprising the circuit of power factor correction
US9236752B2 (en) * 2012-09-07 2016-01-12 Qualcomm Incorporated Method and system for voltage collapse protection
JP6136173B2 (en) 2012-10-03 2017-05-31 サンケン電気株式会社 DC power supply
US9255674B2 (en) 2012-10-04 2016-02-09 Once Innovations, Inc. Method of manufacturing a light emitting diode lighting assembly
US8786215B2 (en) * 2012-12-13 2014-07-22 Chung-Shan Institute Of Science And Technology Double-output high-efficiency LED light-modulating circuit
KR101439899B1 (en) * 2012-12-24 2014-09-12 기민전자주식회사 Led lighting control apparatus
WO2014138629A1 (en) 2013-03-07 2014-09-12 Cirrus Logic, Inc. Utilizing secondary-side conduction time parameters of a switching power converter to provide energy to a load
WO2014164755A2 (en) 2013-03-11 2014-10-09 Cirrus Logic, Inc. Quantization error reduction in constant output current control drivers
EP2974540B1 (en) 2013-03-11 2019-08-07 Signify Holding B.V. Reduction of supply current variations using compensation current control
US9285084B2 (en) 2013-03-14 2016-03-15 Ilumisys, Inc. Diffusers for LED-based lights
CN104053270A (en) * 2013-03-14 2014-09-17 凹凸电子（武汉）有限公司 Light source drive circuit, and controller and method for controlling electric energy for light source
US9253833B2 (en) 2013-05-17 2016-02-02 Cirrus Logic, Inc. Single pin control of bipolar junction transistor (BJT)-based power stage
WO2014186776A1 (en) 2013-05-17 2014-11-20 Cirrus Logic, Inc. Charge pump-based circuitry for bjt power supply
GB201309340D0 (en) 2013-05-23 2013-07-10 Led Lighting Consultants Ltd Improvements relating to power adaptors
US9504106B2 (en) 2013-07-29 2016-11-22 Cirrus Logic, Inc. Compensating for a reverse recovery time period of a bipolar junction transistor (BJT) in switch-mode operation of a light-emitting diode (LED)-based bulb
WO2015017317A2 (en) 2013-07-29 2015-02-05 Cirrus Logic, Inc. Two terminal drive of bipolar junction transistor (bjt) for switch-mode operation of a light emitting diode (led)-based bulb
US10237956B2 (en) 2013-08-02 2019-03-19 Once Innovations, Inc. System and method of illuminating livestock
US9267650B2 (en) 2013-10-09 2016-02-23 Ilumisys, Inc. Lens for an LED-based light
KR101441451B1 (en) 2013-10-21 2014-09-25 전남대학교산학협력단 Second-order resonant buck converter using soft switching technique
GB201322022D0 (en) 2013-12-12 2014-01-29 Led Lighting Consultants Ltd Improvements relating to power adaptors
EP3091832A4 (en) 2014-01-07 2017-10-04 Once Innovations, Inc. System and method of enhancing swine reproduction
EP3097748A1 (en) 2014-01-22 2016-11-30 iLumisys, Inc. Led-based light with addressed leds
US9247603B2 (en) 2014-02-11 2016-01-26 Once Innovations, Inc. Shunt regulator for spectral shift controlled light source
KR20150098431A (en) 2014-02-20 2015-08-28 삼성전기주식회사 Power suppply device
EP2919558B1 (en) * 2014-03-13 2018-10-31 Dialog Semiconductor (UK) Limited Mains synchronized PWM dimming of lighting means
US20150263639A1 (en) 2014-03-14 2015-09-17 Avogy, Inc. Adaptive synchronous switching in a resonant converter
US20150263628A1 (en) * 2014-03-14 2015-09-17 Avogy, Inc. Resonant converter and control
US9214862B2 (en) 2014-04-17 2015-12-15 Philips International, B.V. Systems and methods for valley switching in a switching power converter
US9510400B2 (en) 2014-05-13 2016-11-29 Ilumisys, Inc. User input systems for an LED-based light
US9491819B2 (en) * 2014-07-15 2016-11-08 Dialog Semiconductor Inc. Hysteretic power factor control method for single stage power converters
TWI525977B (en) * 2014-09-11 2016-03-11 Acbel Polytech Inc Power supply and its output voltage low frequency ripple compensation method
US9325236B1 (en) 2014-11-12 2016-04-26 Koninklijke Philips N.V. Controlling power factor in a switching power converter operating in discontinuous conduction mode
CN104578799B (en) * 2014-12-25 2017-04-12 成都芯源系统有限公司 Switching power supply system and control circuit and control method thereof
TWI548304B (en) * 2015-01-05 2016-09-01 國立成功大學 Led driver and driving method thereof
KR102352631B1 (en) 2015-01-30 2022-01-20 주식회사 엘엑스세미콘 Circuit and method to control led lighting apparatus
US9504118B2 (en) 2015-02-17 2016-11-22 Cirrus Logic, Inc. Resistance measurement of a resistor in a bipolar junction transistor (BJT)-based power stage
US10269291B2 (en) * 2015-02-27 2019-04-23 Intel IP Corporation LED driver circuit with reduced external resistances
US9603206B2 (en) 2015-02-27 2017-03-21 Cirrus Logic, Inc. Detection and control mechanism for tail current in a bipolar junction transistor (BJT)-based power stage
US9609701B2 (en) 2015-02-27 2017-03-28 Cirrus Logic, Inc. Switch-mode drive sensing of reverse recovery in bipolar junction transistor (BJT)-based power converters
WO2016182205A2 (en) * 2015-05-13 2016-11-17 주식회사 실리콘웍스 Lighting device and driving circuit therefor
KR102322277B1 (en) * 2015-06-08 2021-11-08 주식회사 엘엑스세미콘 Power supply driving circuit and lighting device including the same
US10161568B2 (en) 2015-06-01 2018-12-25 Ilumisys, Inc. LED-based light with canted outer walls
US10339796B2 (en) 2015-07-07 2019-07-02 Ilumi Sulutions, Inc. Wireless control device and methods thereof
EP3320702B1 (en) 2015-07-07 2022-10-19 Ilumi Solutions, Inc. Wireless communication methods
US11978336B2 (en) 2015-07-07 2024-05-07 Ilumi Solutions, Inc. Wireless control device and methods thereof
KR101796431B1 (en) * 2015-09-08 2017-11-09 유수근 LED Driver and Driving Method for Power Factor Correction
TWI556564B (en) * 2015-09-18 2016-11-01 強弦科技股份有限公司 Converter control system
JP6790350B2 (en) * 2015-12-03 2020-11-25 株式会社オートネットワーク技術研究所 Power supply control device
EP3437437B1 (en) 2016-03-29 2023-07-26 Signify North America Corporation System and method of illuminating livestock
US10314125B2 (en) 2016-09-30 2019-06-04 Once Innovations, Inc. Dimmable analog AC circuit
DE102016226016A1 (en) * 2016-12-22 2018-06-28 Osram Gmbh CIRCUIT ARRANGEMENT FOR OPERATING LIGHT SOURCES AND SENSOR FOR CONNECTION TO A CIRCUIT ARRANGEMENT
WO2018119819A1 (en) * 2016-12-29 2018-07-05 Texas Instruments Incorporated Adaptive turn-off delay time compensation for led controller
TWI628976B (en) * 2017-09-11 2018-07-01 明志科技大學 High-power laser diode driving device and driving and control method thereof
USD857979S1 (en) 2018-03-05 2019-08-27 Intellytech Llc Foldable light emitting mat
USD857980S1 (en) 2018-04-05 2019-08-27 Intellytech Llc Foldable light emitting mat
TWI757794B (en) * 2020-07-15 2022-03-11 群光電能科技股份有限公司 Lamp group switching control device
KR102260710B1 (en) * 2020-11-18 2021-06-07 주식회사 리산테크 Smart converter for lamp control with improved thd and emi and lamp control device including the same
US10998815B1 (en) 2020-11-23 2021-05-04 Robert S. Wrathall Electrical circuits for power factor correction by measurement and removal of overtones

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5377092A (en) * 1992-11-16 1994-12-27 International Power Machines Method and apparatus for harmonic distortion correction
US5461303A (en) * 1994-01-31 1995-10-24 Power Integrations, Inc. Power factor correction precompensation circuit
CA2159842A1 (en) 1994-12-05 1996-06-06 Joe A. Ortiz Diode drive current source
US5661645A (en) 1996-06-27 1997-08-26 Hochstein; Peter A. Power supply for light emitting diode array
JPH1167471A (en) * 1997-08-26 1999-03-09 Tec Corp Lighting system
CA2225004A1 (en) 1997-12-17 1999-06-17 Martin Malenfant Voltage booster for enabling the power factor controller of a led lamp upon low ac or dc supply
JP3692391B2 (en) * 1999-04-16 2005-09-07 矢崎総業株式会社 Power supply control device and power supply control method
DE19930174A1 (en) 1999-06-30 2001-01-04 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Control circuit for LED and associated operating method
US6577072B2 (en) 1999-12-14 2003-06-10 Takion Co., Ltd. Power supply and LED lamp device
US6166527A (en) * 2000-03-27 2000-12-26 Linear Technology Corporation Control circuit and method for maintaining high efficiency in a buck-boost switching regulator
US6657419B2 (en) * 2001-11-19 2003-12-02 Solarmate Corporation Micro-solar insolation circuit
ITVA20020038A1 (en) * 2002-05-30 2003-12-01 St Microelectronics Srl VOLTAGE REGULATOR
JP2004327152A (en) * 2003-04-23 2004-11-18 Toshiba Lighting & Technology Corp Led lighting device and led lighting fixture
US7538534B2 (en) * 2004-11-29 2009-05-26 Supentex, Inc. Method and apparatus for controlling output current of a cascaded DC/DC converter

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101374380B (en) * 2007-07-27 2012-06-27 财团法人工业技术研究院 Light source device and drive device thereof
CN102177766B (en) * 2008-10-09 2014-02-26 赤多尼科有限公司 Driver circuit for a semiconductor light source (led)
CN102362553A (en) * 2009-01-27 2012-02-22 Led道路照明有限公司 Power supply for light emitting diode roadway lighting fixture
CN101932172A (en) * 2009-06-22 2010-12-29 理察·蓝德立·葛瑞 Power reforming method and lighting device thereof
CN102474953A (en) * 2009-07-28 2012-05-23 首尔半导体股份有限公司 Dimming device for a lighting apparatus
CN102474953B (en) * 2009-07-28 2015-03-04 首尔半导体股份有限公司 Dimming device for a lighting apparatus
CN102128973B (en) * 2010-01-19 2015-05-20 深圳艾科创新微电子有限公司 Voltage zero-crossing detecting circuit and DC-DC converter with same
CN102684656B (en) * 2011-03-09 2015-07-15 三菱电机株式会社 Gate circuit
CN102684656A (en) * 2011-03-09 2012-09-19 三菱电机株式会社 Gate circuit
US8810984B2 (en) 2011-03-09 2014-08-19 Mitsubishi Electric Corporation Gate circuit
CN102427343B (en) * 2011-12-02 2014-10-22 成都芯源系统有限公司 Timing signal generating circuit and method and power supply circuit
CN102427343A (en) * 2011-12-02 2012-04-25 成都芯源系统有限公司 Timing signal generating circuit and method and power supply circuit
CN104429160B (en) * 2012-06-27 2017-08-25 飞利浦照明控股有限公司 Drive circuit between electromagnetic ballast and LED
CN104429160A (en) * 2012-06-27 2015-03-18 皇家飞利浦有限公司 Driver circuit between electromagnetic ballast and LED
CN102843026B (en) * 2012-08-17 2015-03-25 佛山市柏克新能科技股份有限公司 Active power factor correction (PFC) control circuit based on complex programmable logic device (CPLD)
CN102843026A (en) * 2012-08-17 2012-12-26 佛山市柏克新能科技股份有限公司 Active power factor correction (PFC) control circuit based on complex programmable logic device (CPLD)
CN103841712B (en) * 2012-11-27 2015-09-09 中国科学院沈阳自动化研究所 A kind of LED light source control system and method
CN103841712A (en) * 2012-11-27 2014-06-04 中国科学院沈阳自动化研究所 System and method for controlling LED light source
CN108075634A (en) * 2016-11-17 2018-05-25 台达电子电源(东莞)有限公司 For the control device and control method of power factor correcting converter
CN108075634B (en) * 2016-11-17 2020-05-01 台达电子电源(东莞)有限公司 Control device and control method for power factor correction converter
CN108646635A (en) * 2018-06-27 2018-10-12 广东好帮手环球科技有限公司 A kind of power control

Also Published As

Publication number Publication date
CN101199239B (en) 2011-10-05
KR101365924B1 (en) 2014-02-20
TW200704284A (en) 2007-01-16
US7378805B2 (en) 2008-05-27
WO2006102355A2 (en) 2006-09-28
WO2006102355A3 (en) 2007-04-19
JP2008537459A (en) 2008-09-11
US20060214603A1 (en) 2006-09-28
TWI446833B (en) 2014-07-21
KR20080002852A (en) 2008-01-04

Similar Documents

Publication Publication Date Title
CN101199239B (en) Single-stage digital power converter for driving LEDs
Wang et al. A review of LED drivers and related technologies
RU2396691C1 (en) Cycloconverter and its operating methods
Lee et al. A single-switch AC–DC LED driver based on a boost-flyback PFC converter with lossless snubber
Hwu et al. Powering LED using high-efficiency SR flyback converter
Lo et al. Design and implementation of RGB LED drivers for LCD backlight modules
US11310883B2 (en) Electrolytic capacitorless, selectively dimmable LED driver
CN104272878A (en) Light emitting diode driver with isolated control circuits
JP7261909B2 (en) Operation control method, circuit, home appliance and computer readable storage medium
CN101989818A (en) Two-stage exchange type power switching circuit
Yadlapalli et al. An overview of energy efficient solid state LED driver topologies
Mujjalinvimut et al. An improved asymmetrical half-bridge converter with self-driven synchronous rectifier for dimmable LED lighting
CN110165895A (en) A kind of wide gain FB-HB LLC resonant converter circuit structure of realization and control method
Jha et al. Power quality improvement using bridgeless‐Landsman converter for LED driver
TWI556215B (en) Large area RGB LED lighting with a drive
Malschitzky et al. Integrated bridgeless-boost nonresonant half-bridge converter employing hybrid modulation strategy for LED driver applications
Oh A single-stage power converter for a large screen LCD back-lighting
CN109089343A (en) LED power source power supply unit
CN104467424B (en) Switching Power Supply for display panel
US20120268024A1 (en) Current-sharing backlight driving circuit for light-emitting diodes and method for operating the same
Musumeci Passive and active topologies investigation for LED driver circuits
CN105375807A (en) Direct current (DC)/alternating current (AC) conversion device, direct current/ direct current conversion device and constant current driving device
Pal et al. A novel cost-effective dual-colored LED lighting in household applications
CN205123617U (en) DCAC conversion equipment , DCDC conversion equipment and constant current drive device
CN213151913U (en) Output wide-range adjustable three-level soft switching change circuit

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20111005

CF01 Termination of patent right due to non-payment of annual fee